Photosensor systems for lens detection
Methods, apparatus, systems and articles of manufacture of a photosensor fusion system for lens detection are disclosed herein. An example apparatus includes a projector, a photosensor having a filter and a lens detector to compare an output from the photosensor to a threshold, and a projector controller to selectively enable or disable the projector based on the comparison between the output from the photosensor and the threshold.
1. A projection apparatus comprising:
a projector;
a photosensor having a filter;
a lens detector to compare an output from the photosensor to a threshold, wherein the threshold is between 0% and 10% overlap of the normalized spectral distribution graphs of light passing through the filter and a lens; and
a projector controller to selectively enable or disable the projector based on the comparison between the output from the photosensor and the threshold.
2. The projection apparatus of claim 1 , wherein the projector controller enables the projector in response to determining the output from the photosensor satisfies the threshold.
3. The projection apparatus of claim 2 , wherein the threshold is a first threshold and the projector controller further dims the projector in response to the output from the photosensor satisfying a second threshold.
4. The projection apparatus of claim 1 , wherein the projector controller disables the projector in response to determining the output from the photosensor does not satisfy the threshold.
5. The projection apparatus of claim 1 , wherein the photosensor is a first photosensor, the filter is a first filter, and the output is a first output, further including
a second photosensor having a second filter, the second photosensor producing a second output.
6. The projection apparatus of claim 5 , wherein the projector controller enables the projector in response to determining a relationship between the first and second outputs satisfies the threshold.
7. The projection apparatus of claim 5 , wherein the projector controller disables the projector in response to determining a relationship between the first and second outputs does not satisfy the threshold.
8. The projection apparatus of claim 5 , wherein the first filter is an ultra-violet A shortpass filter and the second filter is a filter matching luminous efficiency function.
9. The projection apparatus of claim 1 , wherein one or more of the projector, the photosensor, the lens detector, and the projector controller is coupled to a head-wearable device.
10. The projection apparatus of claim 1 , wherein one or more of the projector, the photosensor, the lens detector, and the projector controller is integral with a head-wearable device.
11. An apparatus comprising:
a head-wearable device;
a projector coupled to the head-wearable device;
a first photosensor having a first filter;
a second photosensor having a second filter, the second photosensor producing a second ouput;
a lens detector to compare a first output from the first photosensor to a threshold and to detect a lens disposed on the head-wearable device; and
a projector controller to selectively enable or disable the projector based on the output from the photosensor, wherein the projector controller disables the projector in response to determining a relationship between the first and second outputs does not satisfy a threshold.
12. The apparatus of claim 11 , wherein the projector controller enables the projector in response to determining the output from the photosensor satisfies the threshold.
13. The apparatus of claim 12 , wherein the threshold is a first threshold and the projector controller further dims the projector in response to the output from the photosensor satisfying a second threshold.
14. The apparatus of claim 11 , wherein the projector controller disables the projector in response to determining the output from the photosensor does not satisfy the threshold.
15. The apparatus of claim 11 , wherein the projector controller enables the projector in response to determining a relationship between the first and second outputs satisfies the threshold.
16. The apparatus of claim 11 , wherein the threshold is between 0% and 10% overlap of the normalized spectral distribution graphs of light passing through the filter and a lens.
17. A method comprising:
detecting presence of a lens in a head-wearable device including a projector and photosensor having a filter;
detecting an output from the photosensor;
selectively enabling or disabling the projector based on the output from the photosensor, wherein then projector is enabled in response to the output from the photosensor satisfying a first threshold; and
dimming the projector in response to the output from the photosensor satisfying a second threshold.
18. The method of claim 17 , wherein the first threshold is between 0% and 10% overlap of the normalized spectral distribution graphs of light passing through the filter and a lens.
19. A tangible machine-readable storage medium comprising instructions which, when executed, cause a machine to at least:
detect presence of a combiner lens in a head-wearable device by:
comparing a first output of a first photosensor having a first filter to a second output of a second photosensor having a second filter; and
producing a relationship of the first and second outputs; determine if the relationship satisfies a threshold;
enable a projector disposed on the head-wearable device in response to the relationship satisfying the threshold.
20. The tangible machine-readable storage medium of claim 19 , wherein the first filter is an ultra-violet A shortpass filter and the second filter is a filter corresponding to luminous efficiency function.